EP1613646A2 - Procede pour preparer un analogue de la cyclosporine a renfermant un groupe diene terminal - Google Patents

Procede pour preparer un analogue de la cyclosporine a renfermant un groupe diene terminal

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EP1613646A2
EP1613646A2 EP04725333A EP04725333A EP1613646A2 EP 1613646 A2 EP1613646 A2 EP 1613646A2 EP 04725333 A EP04725333 A EP 04725333A EP 04725333 A EP04725333 A EP 04725333A EP 1613646 A2 EP1613646 A2 EP 1613646A2
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formula
compound
conducted
process according
dichloromethane
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Jean-Michel Adam
Mark Abel
Seetharaman Jayaraman
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Isotechnika Inc
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Isotechnika Inc
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
    • C07F5/02—Boron compounds
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
    • C07K7/64—Cyclic peptides containing only normal peptide links
    • C07K7/645—Cyclosporins; Related peptides
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • A61P37/02—Immunomodulators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • A61P37/02—Immunomodulators
    • A61P37/06—Immunosuppressants, e.g. drugs for graft rejection
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C231/00—Preparation of carboxylic acid amides
    • C07C231/12—Preparation of carboxylic acid amides by reactions not involving the formation of carboxamide groups
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
    • C07F7/02—Silicon compounds
    • C07F7/08—Compounds having one or more C—Si linkages
    • C07F7/0803—Compounds with Si-C or Si-Si linkages

Definitions

  • This invention relates to a new process for the preparation of cyclosporin A analog of formula I:
  • the cyclosporin A analog of formula I is structually identical to cyclosporin A except for modification at the 1 -amino acid residue.
  • This analog is disclosed in WO 99/18120 and U.S. Provisional Patent Application No. 60/346,201. Hereinafter this analog is mentioned as (E)-ISA247.
  • Tetrahedron Letters, Vol.22, No.29, p2751-2752, 1981 discloses one of the intermediates of the process of this invention, namely pinacol (E)-l-trimethylsilyl- l-propene-3-boronate, and the allylation process using it.
  • Tetrahedron Letters, Vol.36, No.10, pl583, 1995 discloses allylation process using tartrate modified (E)- ⁇ -(trimethylsilyl)allylboronate.
  • this invention provides a process for the preparation of a cyclosporin A analog of formula I
  • R 1 is hydrogen, C ⁇ _ 8 alkyl or C 3 _ 8 cycloalkyl and/or, when R 1 is hydrogen, a trimer thereof;
  • R 2 is C ⁇ _s alkyl or C 3 _ 8 cycloalkyl
  • this invention provides intermediates for the process mentioned above.
  • this invention provides processes for the preparation of these intermediates.
  • step b) The process of (i), wherein step b) is conducted by
  • step a-i), a-ii) or a-vi) is conducted in dichloromethane or toluene.
  • step a-iii) is conducted in the presence of BF 3 .Et 2 O, formic acid, acetic acid or tartrate esters.
  • step a-iii) is conducted in water/ dichloromethane or water/toluene.
  • step a-iii) and b-i) are conducted in dichloromethane or tetrahydrofuran and in the presence of BF 3 .Et 2 0.
  • step a-iii) is conducted in acetic acid and/or formic acid; or in a mixture of acetic acid and /or formic acid and one or two cosolvents selected from a group consisting of dichloromethane and tetrahydrofuran.
  • step a-iii) is conducted in acetic acid and step b-i) is conducted by addition of formic acid to the reaction mixture.
  • step a-iii) and b-i) are conducted in formic acid or acetic acid/ formic acid.
  • step a-iv The process of (i) or (ii), wherein step a-iv) is conducted in water/dichloromethane or water/toluene.
  • step a-v The process of (iii), wherein step a-v) is conducted in the presence of formic acid or acetic acid.
  • step a-v) and b-i) are conducted in formic acid or acetic acid/formic acid.
  • step a-v) and b-i) are conducted in a mixture of acetic acid/formic acid and co-solvent selected from dichloromethane, toluene, ethyl acetate and isopropyl acetate.
  • step a-v) is conducted in acetic acid and step b-i) is conducted by addition of formic acid to the reaction mixture.
  • step a-vii The process of (iii), wherein step a-vii) is conducted by allylating the compound of formula II with a reaction mixture prepared by reaction of the trimethylsilylallyllithium with diethylaluminum chloride.
  • step a-viii The process of (iii), wherein step a-viii) is conducted by allylating the compound of formula II with a reaction mixture prepared by reaction of trimethylsilylallyllithium with titanium tetraisopropoxide or titanium chlorotriisopropoxide.
  • C a _b alkyl denotes straight chain or branched alkyl residues containing a to b carbon atoms. Therefore, for example, " -s alkyl” means straight chain or branched alkyl residues containing 1 to 8 carbon atoms, such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl or tert-butyl.
  • C3. 8 cycloalkyl refers to a saturated monovalent cyclic hydrocarbon radical of three to eight ring carbons e.g., cyclopropyl, cyclobutyl, cyclohexyl.
  • Protecting group refers to a grouping of atoms that when attached to a reactive group in a molecule masks, reduces or prevents that reactivity. Examples of protecting groups can be found in T.W. Green and P.G. Futs, Protective Groups in Organic Chemistry, (Wiley, 2 nd ed. 1991) and Harrison and Harrison et al., Compendium of Synthetic Organic Methods, Vols. 1-8 (John Wiley and Sons,
  • the starting materials and reagents used in the process of the present invention are either available from commercial suppliers such as Aldrich Chemical
  • the starting materials and the intermediates of the reaction maybe isolated and purified if desired using conventional techniques, including but not limited to filtration, distillation, crystallization, chromatography. Such materials may be characterized using conventional means, including physical constants and spectral data.
  • the all lmetal reagent also referred herein as allylating reagent is to be taken in a general sense and may comprise reagents where the metal part is based on boron although it is not per se a metal.
  • step a) protected cyclosporin A aldehyde of formula II is allylated by ⁇ - silylated allylmetal reagent of formula III, IV, V, VI, VTI, VIII etc. to form a mixture of ⁇ -silylhomoallylic alcohol diastereomers of formula XI (For a general discussion about allylmetals and allylation of aldehydes see : W. R. Roush in "Allyl
  • the aldehyde side chain preferably adopts a pseudo equatorial position in order to minimize 1,3-diaxial steric interactions.
  • the relative configuration of the ⁇ -silylalcohol fragment will therefore be determined by the configuration of C-C double bond of the allylmetal reagent.
  • trans- or cis- ⁇ -silylated allylmetals reagents should lead predominantly to the anti- or syn- ⁇ -silylalcohol isomer respectively. This holds in general, for example, for the allyl-boron, -titanium and -aluminum reagents.
  • step b) the ⁇ -silylalcohol of formula XI is converted to (E)-ISA247 of formula I.
  • Step b) can be carried out as illustrated in Scheme C.
  • step b-i the ⁇ -silylalcohol of formula XI undergoes a Peterson elimination (For a general discussion about Peterson eliminations, see : D. J. Ager in "The Peterson Reaction", Synthesis 1984, p384-397 as well as references cited therein.) and the internal double bond is generated, i.e. the elimination of silanol from the ⁇ - silylalcohol moiety occurs.
  • the success of the allylation-Peterson elimination sequence relies on the selective introduction of a relative anti or syn configuration of the ⁇ -silylalcohol moiety.
  • Anti isomers should give the trans double bond under acidic Peterson elimination conditions whereas syn isomers would provide the cis double bond.
  • the reaction proceeds via a mechanism where the hydroxyl and the silyl groups are in an anti conformation prior to elimination.
  • trans- ⁇ -silylated allylmetals reagents are used for allylation of protected cyclosporin A aldehyde of formula II to form a mixture of anti- ⁇ -silylalcohol diastereomers of formula XL Therefore, a Peterson elimination is performed under acidic condition to form a trans double bond.
  • Typical acids for the acid-promoted reaction may include sulfuric acid, formic acid, chlorhydric acid, methanesulfonic acid tetrafluoroboric acid, perchloric acid, trifluoroacetic acid and various Lewis acids.
  • Preferred acids are sulfuric acid, formic acid, methanesulfonic acid and BF 3 .Et 2 O, especially sulfuric acid, formic acid and BF 3 .Et 2 0.
  • This step can be conducted at a reaction temperature from -70 °C to 50 °C.
  • Preferred temperature range is 0 ° C to 50 °C, more preferably 20 °C to 40 °C for formic acid.
  • Preferred temperature range is 0 °C to 40 °C, more preferably 20 °C to 30 °C for sulfuric and methanesulfonic acid.
  • Preferred temperature range is -80 °C to 50 °C, preferably -80 °C to 25 °C, especially -80 °C to 0 °C for BF 3 .Et 2 O.
  • E-acetyl-ISA247 can be purified by crystallization in MTBE (for example via solvent exchange from dichloromethane to MTBE) or in MeOH/water mixtures.
  • step b-ii) the protecting group is removed, returning the functional group on that carbon to an alcohol.
  • the conditions and reagents to be employed depend on the protecting group used, which are known to those skilled in the art.
  • Acyl group (R'C(O)-; wherein R' is a linear saturated monovalent hydrocarbon radical of one to six carbon atoms or a branched saturated monovalent hydrocarbon radical of three to six carbon atoms) such as acetyl, propionyl, butyryl, isobutyryl, valeryl can preferably be used as a protecting group.
  • the protecting group is an acetyl group, it can be removed, for example, by the treatment with K 2 C0 3 in methanol and water.
  • Bases other than potassium carbonate that may be used to remove the protecting group include sodium hydroxide, sodium carbonate, sodium alkoxide and potassium alkoxide.
  • the reagent of formula III or IV is needed to complete the allylation of acetyl-cyclosporin A aldehyde (II') within an acceptable timeframe.
  • an activating agent such as a tartrate ester and/or dichloromethane as (co)-solvent.
  • the reagent of formula Ilia can potentially exist in the form of cyclic trimer (boroxine) or oligomers (For an example of such behavior of a boronic acid, see: K. Ishihara, H. Kurihara, M. Matsumoto and H.
  • a solution of reagent of formula Ilia can be generated by hydrolysis of complex of formula V in organic solvent/water mixture such as a dichloromethane/water, toluene/water, ethyl acetate/water, THF/water, chloroform/water mixture, preferably a dichloromethane/water mixture, preferably in the presence of an acid such as sulfuric acid, chlorhydric acid, acetic acid, preferably acetic acid. Allylation of acetyl-cyclosporin A aldehyde with a dichloromethane solution of reagent of formula Ilia prepared as just described can reach high conversions using as low as 2 equivalents of the reagent. In this case, isopropyl derivatives are of course absent.
  • organic solvent/water mixture such as a dichloromethane/water, toluene/water, ethyl acetate/water, THF/water, chloroform/water mixture, preferably a dichloromethane/water mixture
  • Toluene can be used as solvent for these reactions, however, marked solvent effects have been observed in these reactions.
  • the allylation is best performed in polar non-coordinating solvents, preferably dichloromethane.
  • allylation is preferably performed in dichloromethane using a concentrated solution of the crude boronic acid(>10%, preferably ca 50% concentration).
  • Preferred reagent of formula III wherein R is hydrogen, C ⁇ _ 8 alkyl or C 3 . 8 cycloalkyl and/ or, when R 1 is hydrogen, a trimer thereof are those wherein R 1 is hydrogen, methyl, ethyl, propyl, isopropyl, butyl or benzyl, more preferably R 1 is hydrogen, methyl, ethyl, propyl, isopropyl or butyl, further preferably hydrogen, methyl, ethyl, propyl or butyl, especially preferably hydrogen.
  • Allylation is performed in organic solvent such as ethyl acetate, THF, toluene, chloroform or dichloromethane, preferably in ethyl acetate, toluene or dichloromethane, more preferably in toluene or dichloromethane, especially in dichloromethane.
  • organic solvent such as ethyl acetate, THF, toluene, chloroform or dichloromethane, preferably in ethyl acetate, toluene or dichloromethane, more preferably in toluene or dichloromethane, especially in dichloromethane.
  • the Peterson elimination can take place directly on the allylation reaction mixture by addition of THF and sulfuric acid. Aqueous work-up and crystallization yields the (E)-acetyI-ISA247 (XIT).
  • a tartrate ester such as, for example, L-(+)-dimethyltartrate
  • a drying agent activates the boronic acid of formula Ilia by generating in-situ the corresponding boronate ester, a reagent class known in the literature to exhibit very high allylation reactivity.
  • the reaction then proceeds partially or mainly through the generated boronate ester increasing the rate of the allylation.
  • R is - 8 alkyl, preferably C ⁇ . 6 alkyl, more preferably methyl, ethyl or isopropyl, especially methyl.
  • Allylation with reagent of formula IV is performed in organic solvent such as ethyl acetate, THF, toluene, chloroform or dichloromethane, preferably in ethyl acetate, toluene or dichloromethane, more preferably in toluene or dichloromethane, especially in dichloromethane.
  • organic solvent such as ethyl acetate, THF, toluene, chloroform or dichloromethane, preferably in ethyl acetate, toluene or dichloromethane, more preferably in toluene or dichloromethane, especially in dichloromethane.
  • reaction involving the use of crude boronic acid solution with or without tartrate activation should be performed at neutral or acidic pH (between 3 and 7, preferably between 5 and 6). Indeed when the pH is over 7, substantial amount of a side-product identified as the vinylsilane of formula XV are formed.
  • a test reaction (performed without tartrate activation) where Et 3 N amine was added to reach a pH of 9-10 led to the almost exclusive formation of the vinylsilane product XV (as evidenced by MS, 1H NMR, COSY, TOCSY and HSQC NMR experiments). Such an effect was totally unexpected.
  • the diethanolamine complex of formula V does not react at RT with acetyl-cyclosporin A aldehyde in non protic solvents like dichloromethane or THF.
  • the complex of formula V represent a stable source of the corresponding boronic acid.
  • a water/ organic solvent such as ethyl acetate, THF, dichloromethane or toluene, preferably ethyl acetate, dichloromethane or toluene, more preferably dichloromethane
  • the diethanolamine complex V is hydrolyzed and liberates the reactive boronic acid as shown, for example, in Scheme H, which can then reacts with the acetyl- cyclosporin A aldehyde (II'), preferably at RT.
  • Allylmetalation of acetyl-cyclosporin A aldehyde (IF) can also take place under non-aqueous conditions directly with complex of formula V. Indeed, protic solvents such as carboxylic acids are particularly effective. Solvent mixture could be acetic acid and/ or formic acid or a combination of acetic acid and/or formic acid and a co-solvent such as dichloromethane and THF. The allylation is best performed in acetic acid between RT and 35 °C.
  • Another alternative consists in performing the addition of complex of formula V to acetyl-cyclosporin A aldehyde (IF) in the presence of a Lewis acid such as BF 3 .Et 2 0.
  • a Lewis acid such as BF 3 .Et 2 0.
  • the reaction with BF 3 .Et 2 O can be performed in a solvent such as dichloromethane or THF at a temperature ranging from -40 °C to RT. Under these conditions, the allylation can directly be followed by the Peterson elimination, yielding the expected (E)-acetyl-ISA247 (XIF).
  • Reacting the allyltrifluoroborate VI and acetyl-cyclosporin A aldehyde (IF) in a biphasic water/ organic solvent, preferably water/dichloromethane mixture or water/toluene mixture, more preferably water/dichloromethane mixture at RT provides a mixture of anti ⁇ -trimethylsilylalcohol diastereomers (XF).
  • a biphasic water/ organic solvent preferably water/dichloromethane mixture or water/toluene mixture, more preferably water/dichloromethane mixture at RT provides a mixture of anti ⁇ -trimethylsilylalcohol diastereomers (XF).
  • the Peterson elimination is performed by addition of THF and sulfuric acid at a temperature of 0 °C to RT providing (E)-acetyl-ISA247 (XIF).
  • Peterson elimination can also be performed under standard conditions (sulfuric acid in THF) after isolation of the anti ⁇ -trimethylsilylalcohol diastereomers to give E-acetyl-ISA247.
  • the allylation can also be promoted by a Lewis acid.
  • the allylation and the Peterson elimination can take place in-situ.
  • addition of excess BF 3 .Et 2 0 to a suspension of allyltrifluoroborate VI (2 equiv.) in a solution of acetyl-cyclosporin A aldehyde (XIF) in dichloromethane at -70 °C provides after 60 min. reaction and aqueous work-up, (E)-acetyl-ISA247 (I).
  • Solvents for the reaction are organic solvent such as dichloromethane, THF or toluene, preferably dichloromethane.
  • Carboxylic acids such as formic acid or acetic acid were found to dramatically enhance the rate of allylation.
  • allylation of acetyl cyclosporin A aldehyde (IF) can reach conversion of over 95% within 5 hours at RT with 2 equivalents of reagent of formula VI, providing the ⁇ - silylalcohols (XI').
  • formic acid promotes the Peterson elimination.
  • (E)-acetyl-ISA247 (XIF) is obtained after extractive work-up ascertaining the relative anti stereochemistry of the intermediate ⁇ -silylalcohols.
  • Peterson elimination can also be performed under standard conditions (sulfuric acid in THF) after isolation of the anti ⁇ -trimethylsilylalcohol diastereomers to give (E)-acetyl-ISA247.
  • the allylmetalation and the following Peterson elimination can take place in one-pot.
  • a combination of acetic acid and formic acid ca 1:1 v/v
  • the allylation of acetyl-cyclosporin A aldehyde and the following Peterson elimination reach over 90% conversion within 60 min. at RT with 1.5 equivalent of reagent.
  • Aqueous extractive work-up and crystallization furnishes (E)-acetyl-ISA247 (XIF).
  • acetic acid formic acid and a suitable co-solvent
  • Dichloromethane, toluene, ethyl acetate or isopropyl acetate, preferably isopropyl acetate could be used as co-solvent. Decrease in reactivity can be observed when using a co-solvent but this could be compensated by increasing the reaction temperature.
  • reagent of formula VII to acetyl cyclosporin A aldehyde (IF) can be promoted by a Lewis acid such as BF 3 .Et 2 O at a temperature of -70 °C to
  • the ⁇ -silylated allylmetal reagents required for the allylmetalation step are best generated from the corresponding allylsilanes via deprotonation, trapping with an adequate metal reagent and optionally by further complexation of the metal rest by a suitable ligand.
  • the resulting reagents can, depending on their stability and the process, be used in situ or be isolated and stored.
  • the allyltrimethylsilane is deprotonated by n- butyllithium in THF at a temperature ranging from 0 °C to 35 °C, preferably bewteen 0 °C and 25 °C for 30 min. up to 3 hours.
  • This generates a trimethylsilylallyllithium intermediate.
  • This intermediate most probably exists in solution as a ⁇ -allyl complex of lithium in a trans configuration (T. H. Chan in "Silylallyl Anions in Organic Synthesis: A Study in Regio- and Stereoselectivity",
  • M and M' are a metallic fragment comprising the metal and its ligands.
  • a solution of crude boronic acid of formula Ilia is obtained after deprotonation of allyltrimethylsilane, trapping with an electrophilic boron reagent and aqueous work- up.
  • the deprotonation of allyltrimethylsilane is performed in THF with butyllithium, between 0 °C and 35 °C, preferably between 0 °C and 25 °C for 30min. to 3 hours.
  • the electrophilic boron reagent is a trialkylborate such as triisopropyl borate or trimethyl borate, preferably triisopropyl borate.
  • the trapping of the trimethylsilylallyllithium intermediate with triispropyl borate is performed between -80 °C and -20 °C, preferably below -60 °C for 30 min. to 2 hours.
  • the trapping of the trimethylsilylallyllithium intermediate with trimethyl borate is performed between -80 °C and -60 °C for 30 min. to 2 hours.
  • Crotylboronates Preparation of the Chiral Crotylboronates and Reactions with Achiral Aldehydes", Journal of the American Chemical Society 1990, 112, 6339 (see reference 17)).
  • Concentrated solutions (>10% concentration, for example ca 50% concentration) are not stable at RT and decompose. They should be rapidly used. If needed they should be stored at 5 °C maximum.
  • the boronic acid of formula Ilia might in principle also exists in the form of a cyclic trimer (also called a boroxine) or oligomers.
  • a solution of reagent of formula Ilia can be prepared by hydrolysis of complex of formula V in an organic solvent/water mixture such as a dichloromethane/water, toluene/water, ethyl acetate/water, THF/water, chloroform/water mixture, preferably a dichloromethane/water mixture preferably in the presence of an acid such as sulfuric acid, chlorhydric acid, acetic acid, preferably acetic acid.
  • an organic solvent/water mixture such as a dichloromethane/water, toluene/water, ethyl acetate/water, THF/water, chloroform/water mixture, preferably a dichloromethane/water mixture preferably in the presence of an acid such as sulfuric acid, chlorhydric acid, acetic acid, preferably acetic acid.
  • Boronate reagent of formula IV where R is .s alkyl, preferably C ⁇ - 6 alkyl, more preferably methyl, ethyl or isopropyl, especially methyl is prepared by treating boron reagent of formula Ilia with the required tartrate ester in the presence of a drying agent such molecular sieves or magnesium sulfate, preferably magnesium sulfate.
  • Reagent of formula IVa' is prepared by mixing a solution of boronic acid of formula Ilia with L-(+)-dimethyltartrate, in the presence of a drying agent such molecular sieves or magnesium sulfate, preferably magnesium sulfate , as evidenced by n B and 1H NMR analyses.
  • ⁇ -silylated allylboron reagent of formula III This reagent can be prepared by treating boron reagent of formula Ilia with the required alcohol in the presence of a drying agent such molecular sieves or magnesium sulfate, preferably magnesium sulfate.
  • a drying agent such molecular sieves or magnesium sulfate, preferably magnesium sulfate.
  • R 8 cycloalkyl are those wherein R 1 is methyl, ethyl, propyl, isopropyl, butyl or benzyl, more preferably R 1 is methyl, ethyl, propyl, isopropyl or butyl, further preferably R 1 is methyl, ethyl, propyl or butyl, especially preferably R 1 is methyl.
  • Ilia VI as a methanol solution
  • allyltrifluoroborate potassium salts are prepared by treating the corresponding boronic acid with 3 equivalents of KHF 2 in a water/methanol solvent mixture (see for example : R. A. Batey in "Diastereoselective Allylation and Crotylation Reactions of Aldehydes with Potassium Allyl- and CiOtyltrifluoroborates under Lewis acid Catalysis", Synthesis 2000, pp 990-998).
  • the required boronic acid solution is prepared by hydrolyzing the diethanolamine complex of formula V in a water/dichloromethane mixture in the presence of an acid such as acetic acid.
  • the aqueous phase is discarded and the solvent is exchanged from dichloromethane to methanol.
  • the diethanolamine complex V can be used directly as starting material.
  • the trifluoroborate salts VI can be prepared, however, crystallization does not occur.
  • pinacol complex VII can then be distilled under low pressure or used directly in the allylmetalation step.
  • the preparation of the pinacol complex of formula VII is, for example, performed as illustrated in Scheme O.
  • the trapping of the 1-trimethylsilylallyl lithium can be performed with 2-isopropoxy-4,4,5,5-tetramethyl-l,3,2-dioxaborolane, leading directly after aqueous work-up to the pinacol boronate of formula VII.
  • the reagent can be prepared by deprotonation of allytrimethylsilane at room temperature with butyllithium, quench of the allylithium intermediate with tri-ispropylborate (between -80 °C to -20 °C, preferably between -80 °C and -30 °C), addition of pinacol and then aqueous work- up.
  • the (trimethylsilyl) allyltitanium reagents are prepared in-situ via deprotonation of allyltrimethylsilane to form trimethylsilylallylithium, as described above, and reaction of this intermediate with titanium dichlorodiisopropoxide, titanium tetraisopropoxide or titanium chlorotriisopropoxide, preferably titanium tetraisopropoxide or titanium chlorotriisopropoxide at a temperature of-80 °C to 0 °C, preferably -80 °C to -30 °C, more preferably -80 °C to -50 °C, especially - 80 °C to -60 °C.
  • the resulting titanium reagents are used in situ for the allylation of protected cyclosporin A aldehydes. Putative structures for theses reagents are presented below :
  • the (trimethylsilyl) allylaluminum reagents are prepared in-situ via deprotonation of allyltrimethylsilane to form trimethylsilylallylithium, as described above, and reaction of this intermediate with a dialkylaluminum chloride such as diethylaluminum chloride or with an alkylaluminum dichloride such as ethylaluminum dichloride, preferably with diethylaluminum chloride, at a temperature of -80 °C to 0 °C, preferably -80 °C to -30 °C, more preferably -80 °C to -50 °C, especially -80 °C to -60 °C.
  • the resulting aluminum reagents are used in situ for the allylation of protected cyclosporin A aldehydes.
  • a protecting group is introduced in cyclosporin A of formula XIII, to protect hydroxyl group at the ⁇ -position of the side chain of the 1 -amino acid residue.
  • Protecting groups are well known in organic synthesis, and have been discussed by J. R. Hanson in Chapter 2,"The Protection of Alcohols,” of the publication Protecting Groups in Organic Synthesis (Sheffield Academic Press, Sheffield, England, 1999), pp. 24-25. Hanson teaches how to protect hydroxyl groups by converting them to either esters or ethers. Acetate esters are perhaps the most frequently used type of chemistry for protecting hydroxyl groups. There are a wide range of conditions that maybe used to introduce the acetate group.
  • reagents and solvents include acetic anhydride and pyridine; acetic anhydride, pyridine and dimethylaminopyridine (DMAP); acetic anhydride and sodium acetate; acetic anhydride and toluene-p-sulphonic acid, acetyl chloride, pyridine and DMAP; and ketene.
  • DMAP is a useful acylation catalyst because of the formation of a highly reactive N-acylpyridium salt from the anhydride.
  • the ⁇ -alcohol of cyclosporin A is protected as an acetate by reacting cyclosporin A (XIII) with acetyl chloride, ethyl acetate, or combinations thereof, forming the compound, acetyl cyclosporin A.
  • the ⁇ - alcohol undergoes a nucleophilic addition to acetic anhydride, forming acetyl cyclosporin A and acetic acid.
  • DMAP dimethylaminopyridine
  • protecting groups other than acetate esters may be used to protect the ⁇ -alcohol of the 1 -amino acid residue of cyclosporin A.
  • These protecting groups may include benzoate esters, substituted benzoate esters, ethers, and silyl ethers. Under certain reaction conditions, the acetate protecting group is prone to undesirable side reactions such as elimination and hydrolysis. Since benzoate esters, ethers and silyl ethers are often more resistant to such side reactions under those same reaction conditions, it is often advantageous to employ such protecting groups in place of acetate.
  • step c-ii) the protected cyclosporin A of formula XIV is converted to a protected cyclosporin A aldehyde of formula II.
  • This step can be carried out, for example, by using ozone as an oxidizing agent followed by work-up with a reducing agent to form a protected cyclosporin A aldehyde (II).
  • Ozonolysis step is conducted at a temperature range from about -80 °C to 0 °C.
  • the solvent used during the ozonolysis maybe a lower alcohol such as methanol.
  • the reducing agent may be a trialkylphosphine such as tributylphosphine, a triarylphosphine, a trialykylamine such as triethylamine, an alkylaminosulfide, a thiosulfate or a dialkylsulfide such as dimethylsulfide.
  • a protected cyclosporin A aldehyde (II) can be prepared by converting the protected cyclosporinA XIV, such as acetyl cyclosporin A, to the protected cyclosporin A epoxide with a monopersulfate, preferably oxone, in the presence of a ketone, such as acetoxyacetone or diacetoxyacetone. This step is performed in an organic solvent which is inert under these reaction conditions such as acetonitrile and water. Ethylenediamintetra-acetic acid disodium salt is added to capture any heavy metal ions which might be present. The epoxidation reaction is carried out preferably at a pH over 7.
  • This epoxidation reaction is followed by oxidative cleavage of the epoxide with periodic acid or periodate salt under acidic conditions.
  • the oxidation and the oxidative cleavage can be combined in a work-up procedure.
  • Carlsen et al. in "A Greatly Improved Procedure for Ruthenium Tetroxide Catalyzed Oxidations of Organic Compounds," J. Org. Chem., Vol. 46, No. 19, pp 3736-3738 (1981). Carlsen et al. teach that, historically, the expense of ruthenium metal provided an incentive for the development of catalytic procedures, the most popular of which used periodate or hypochlorite as stoichiometric oxidants. These investigators found a loss of catalytic activity during the course of the reaction with the conventional use of ruthenium which they postulated to be due to the presence of carboxylic acids.
  • nitriles to the reaction mixture, especially acetonitrile, was found to significantly enhance the rate and extent of the oxidative cleavage of alkenes in a CCl 4 /H 2 0/I ⁇ 4 _ system.
  • protected cyclosporin A aldehyde (II) can be produced from protected cyclosporin A (XIV), such as acetyl cyclosporin A, by dissolving it in a mixture of acetonitrile and water, and then adding first sodium periodate and then ruthenium ' chloride hydrate. The aldehyde (II) maybe extracted with ethyl acetate.
  • the organic phases were washed sequentially with 150 ml of a saturated aqueous NaCl solution, combined, dried over Na 2 SO 4 , filtered and concentrated under reduced pressure to ca 40 ml.
  • the weight of the solution was adjusted to 53.6 g by addition of dichloromethane in order to obtain a ca 50% solution of boronic acid (based on the starting allyltrimethylsilane).
  • (E)-acetyl-ISA247 can be recrystallized by dissolving the solid in dichloromethane at room temperature and exchanging the solvent to MTBE (by adding MTBE, concentrating the solution to half its volume under reduced pressure at 40°C and repeating these operation 2 to three times). The solution is cooled to room temperature and the crystallization then starts within a few minutes. The suspension is stirred at room temperature for 2h and 30min at 0°C. The crystals of (E)-acetyl-ISA247 are isolated after filtration, washing with MTBE and drying under reduced pressure at 40°C.
  • the crude ⁇ -trimethylsilyalcohol diastereomers mixture (11 g, maximum 4.056 mmol) was dissolved in 25 ml THF. 0.679 ml (12.16 mmol, 3 equiv.) concentrated sulfuric were added dropwise maintaining the temperature between 20 °C and 25 °C. After 2 hours at RT, 50 ml half saturated aqueous NaCl solution were added. The resulting mixture was extracted twice with 50 ml MTBE. The organic phases were washed with 50ml of a half saturated aqueous NaCl solution, combined, dried over Na 2 SO and concentrated under reduce pressure at 40°C.
  • the aqueous layer was separated and discarded.
  • the organic phase was washed with 40 ml NaHC0 3 aq , 20 ml saturated NaCl aq , 40 ml saturated NaCl aq , dried over Na 2 SO 4 , filtered and concentrated at 40 °C under reduced pressure.
  • the crude E-acetyl-ISA247 was re-dissolved in 200 ml MTBE and crystallization started within a few minutes. After 15 min.
  • the organic phase was washed with 120 ml water, 204 ml 2M aqueous NaOH solution and 60 ml water. The organic phase was concentrated at 30 °C until the crystallization started. 200 ml MTBE were added and the suspension was concentrated to ca 220 ml. After stirring at RT for 2 hours and for 1 hour at 0-2 °C, the suspension was filtered. The solid was washed with 30 ml MTBE and dried at 50 °C under reduced pressure to provide 18 g of (E)-acetyl- ISA247 as a white powder in >98% double bond isomeric purity (by NMR).
  • the filtrate was concentrated under reduced pressure at 40 °C to ca 25 ml.
  • the solution was cooled to 0-2 °C and the a white suspension was obtained. After 30 min. at 0-2 °C, the suspension was filtered and the solid was washed with cold methanol (-20 °C) and dried under reduced pressure at 40 °C to give 3.4 g of a white powder.
  • Ci 5 H ⁇ 3 F 3 BKSi (contains 1.08 equiv. H 2 O by Karl-Fischer titration and 0.5 equiv. KF) :
  • reaction mixture was stirred for 2 hours at -76 °C. The temperature was slowly raised to -40 °C and the stirring was continued for a further 2 hours at -40 °C. The reaction mixture was poured onto a mixture consisting of 32.5 ml of a 1M aqueous HC1 solution and 20 ml MTBE. 16.2 ml of a
  • the crude product was dissolved in 11.15 ml THF and 268 ⁇ l concentrated sulfuric acid were added. The reaction mixture was heated at 33 °C for 1.5 hour and then cooled to RT. 22 ml water were added and the reaction mixture was extracted with 22 ml MTBE. The aqueous phase was re-extracted with 11 ml MTBE. The organic layer were washed with 11 ml water, combined, dried over Na 2 S0 4 , filtered and concentrated at 40 °C under reduced pressure to give 1.89 g of crude (E)-acetyl-ISA247 as a beige powder. The crude product was re-dissolved in
  • the crude product was dissolved in 8 ml THF at RT. The solution was cooled to 0-5 °C and 200 ⁇ l of concentrated sulfuric acid were added dropwise. The temperature was raised to RT and the reaction mixture was stirred 10 hours. 40 ml MTBE and 15 ml of water were added. The water phase was separated and discarded. The organic phase was washed 15 ml of a 5% aqueous NaHC0 3 solution, 15 ml of a half saturated aqueous NaCl solution, dried over Na 2 S0 4 , filtered and concentrated under reduced pressure to give 1.8 g of crude E-acetyl- ISA247. The crude diene was dissolved in 20 ml dichloromethane.
  • the organic phase was washed with 35 ml of 1M aqueous HCl solution, 25 ml of water, 25 ml of a saturated aqueous NaCl solution, dried over Na 2 S0 4 , filtered and concentrated under reduced pressure to provide 2 g of the crude mixture of anti ⁇ -trimethylsilylalcohol diastereomers as a solidifying oil.
  • the crude product was dissolved in 10 ml THF at RT. The solution was cooled to 0-5 °C and 200 ⁇ l of concentrated sulfuric acid were added dropwise. The temperature was raised to RT and the reaction mixture was stirred overnight. 40 ml MTBE and 15 ml of water were added. The water phase was separated and discarded. The organic phase was washed with 15 ml water, 15 ml of a 5% aqueous NaHC0 3 solution, 15 ml of a half saturated aqueous NaCl solution, filtered and concentrated under reduced pressure to give 1.8 g of crude E-acetyl-ISA247. The crude diene was redissolved in 35 ml of MTBE.
  • the organic phase was concentrated to ca 280 ml. 130 ml water were added over ca 60 min. at 20-25 °C.
  • the resulting white suspension was stirred 60 min. at room temperature.

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Abstract

La présente invention concerne un nouveau procédé pour préparer un analogue de la cyclosporine A de formule I, comprenant les étapes suivantes: a) allylation d'un aldéhyde de cyclosporine A protégé avec un réactif d'allylation; et b) conversion du composé obtenu dans l'étape a) en l'analogue de cyclosporine A de formule I.
EP04725333A 2003-04-08 2004-04-02 Procede pour preparer un analogue de la cyclosporine a renfermant un groupe diene terminal Withdrawn EP1613646A2 (fr)

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WO2006041631A2 (fr) * 2004-10-06 2006-04-20 Amr Technology, Inc. Alcynes de cyclosporine, et leur utilite comme agents pharmaceutiques
KR100780718B1 (ko) 2004-12-28 2007-12-26 엘지.필립스 엘시디 주식회사 도포액 공급장치를 구비한 슬릿코터
US9681105B2 (en) 2005-12-29 2017-06-13 Rovi Guides, Inc. Interactive media guidance system having multiple devices
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JP5668476B2 (ja) 2007-10-08 2015-02-12 オーリニア・ファーマシューティカルズ・インコーポレイテッドＡｕｒｉｎｉａ Ｐｈａｒｍａｃｅｕｔｉｃａｌｓ Ｉｎｃ． カルシニューリン阻害剤またはｍＴＯＲ阻害剤を含む眼科用組成物
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ECSP056091A (es) 2006-03-01
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